CN115462895A

CN115462895A - Ablation device

Info

Publication number: CN115462895A
Application number: CN202210955742.4A
Authority: CN
Inventors: 孙雅逊; 董元博; 罗小平; 张明芳
Original assignee: Suzhou Sanasi Medical Technology Co ltd
Current assignee: Suzhou Sainasi Medical Technology Co ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-12-13

Abstract

The present application relates to an ablation device including a catheter and an ablation assembly. An infusion channel is arranged in the catheter; the ablation assembly comprises an ablation electrode and a fixing piece, the fixing piece is connected with one end of the ablation electrode, the catheter is connected with the other end of the ablation electrode, a cavity communicated with the infusion channel is formed inside the ablation electrode, a perfusion hole communicated with the cavity is formed in the ablation electrode in a penetrating mode, the fixing piece is used for being fixed to target tissue, and the ablation electrode is used for ablating the target tissue.

Description

Ablation device

Technical Field

The invention relates to the technical field of medical instruments, in particular to an ablation device.

Background

In recent years, a large number of clinical studies have shown that ablation therapy and surgery are superior to general drug therapy in the treatment of hypertrophic obstructive cardiomyopathy. The ablation therapy mainly comprises radio frequency, freezing, ultrasound, laser and the like.

However, the conventional ablation device has a problem of insufficient safety during the ablation treatment of the myocardial tissue by extending into the heart of the human body.

Disclosure of Invention

In view of the above, there is a need to address the above issues and to provide an ablation device.

An ablation device, comprising:

the catheter is internally provided with a transfusion channel;

the ablation assembly comprises an ablation electrode and a fixing piece, wherein the fixing piece is connected with one end of the ablation electrode, the catheter is connected with the other end of the ablation electrode, a cavity communicated with the infusion channel is formed inside the ablation electrode, a perfusion hole communicated with the cavity is formed in the ablation electrode in a penetrating mode, the fixing piece is used for being fixed to target tissue, and the ablation electrode is used for ablating the target tissue.

According to the ablation device, a user can enable one end, provided with the ablation assembly, of the catheter to be close to the target tissue, fix the catheter on the target tissue through the fixing piece, and ablate the target tissue through the ablation electrode, for example, the ablation electrode can release current to enable resistance electrothermal effect to be generated in the target tissue until the target tissue is dehydrated and necrotized, so that ablation treatment is achieved. The ablation electrode can be fixed with the target tissue through the fixing piece during the treatment process, and therefore the ablation electrode can be prevented from being shifted in position during the ablation of the target tissue and losing other non-target tissues. Wherein, the transfusion channel can be used for conveying liquid such as physiological saline and the like. The catheter can deliver the physiological saline into the cavity of the ablation electrode through the infusion channel, and in the treatment process, the physiological saline in the cavity can flow out of the infusion hole to cool the ablation electrode and the target tissues around the ablation electrode, so that the temperature of the ablation electrode and the surrounding environment is kept within a certain temperature range, the risk that the target tissues around the ablation electrode form eschar or thrombus and other impurities can be avoided, the ablation electrode can reach a sufficient ablation depth, and the safety and the effectiveness of the operation are improved.

In one embodiment, the ablation electrode is provided with a first end and a second end which are far away from each other along the axial direction, the first end is connected with the fixing piece, the second end is connected with the catheter, and the perfusion hole is formed in the outer circumferential surface of the ablation electrode.

In one embodiment, the plurality of groups of perfusion holes are arranged, and the groups of perfusion holes are distributed on the outer circumferential surface of the ablation electrode at intervals along the axial direction of the ablation electrode.

In one embodiment, each set of the irrigation holes comprises a plurality of irrigation sub-holes, and the plurality of irrigation sub-holes are distributed at intervals along the circumference of the ablation electrode.

In one embodiment, each group of the perfusion holes comprises a plurality of perfusion sub-holes, and the plurality of perfusion sub-holes are distributed at equal intervals along the circumference of the ablation electrode. Such an arrangement allows saline to cool the ablation electrode and its surrounding target tissue from multiple angles, i.e., faster and more comprehensive cooling.

In one embodiment, the perfusion hole is arranged in a plurality of numbers, and the plurality of perfusion holes are distributed at intervals along the circumference of the ablation electrode.

In one embodiment, the perfusion hole is arranged in a plurality of numbers, and the plurality of perfusion holes are distributed at equal intervals along the circumference of the ablation electrode. Such an arrangement allows saline to cool the ablation electrode and its surrounding target tissue from multiple angles, i.e., faster and more comprehensive cooling.

In one embodiment, the fixing element is in a spiral shape, one end of the fixing element far away from the ablation electrode is a tip, and the catheter is configured to drive the fixing element to rotate under the action of external force so as to drill and fix the fixing element into the target tissue. This may allow the fastener to penetrate more easily into the target tissue, since the end of the fastener remote from the catheter is pointed. And because the fixing piece is in a spiral shape, when the fixing piece drills into the target tissue, the fixing piece can be abutted against the target tissue around the fixing piece, the ablation electrode cannot move in the axial direction and the radial direction, and the fixing piece can be reliably fixed in the target tissue. After the target spot of the target tissue is ablated, the fixing piece can be screwed out through the catheter to enable the fixing piece to be separated from the target tissue, and then the fixing piece is reused to drill into the next target spot for ablation until all the target spots of the target tissue are ablated.

In one embodiment, a fixing groove is formed at one end of the ablation electrode, which is far away from the catheter, and the fixing piece is embedded in the fixing groove.

In one embodiment, the fixing member is connected to the ablation electrode in an insulated manner. The arrangement can be regarded that the fixing piece does not have an ablation effect, and the target tissues around the fixing piece cannot be ablated, so that the fixing piece can always keep a good fixing effect with the target tissues around the fixing piece.

In one embodiment, the ablation tissue further comprises a connecting piece, the connecting piece is arranged at one end of the ablation electrode close to the catheter, and the ablation electrode is connected with the catheter through the connecting piece.

In one embodiment, a limiting concave part is arranged on one side of the catheter close to the ablation electrode, a limiting convex part matched with the limiting concave part is arranged on one side of the connecting piece opposite to the ablation electrode, and the connecting piece extends into the limiting concave part through the limiting convex part to be fixed with the catheter.

In one embodiment, the connector is integrally formed with the ablation electrode.

In one embodiment, the connector is in insulated connection with the conduit.

In one embodiment, the catheter comprises a catheter body and a first lead wire arranged in the catheter body, wherein the first lead wire is electrically connected with the ablation electrode. The first wire may provide electrical energy to the ablation electrode, which may be a radio frequency ablation electrode.

In one embodiment, the ablation assembly further comprises a temperature measuring element arranged in the cavity, the temperature measuring element is used for detecting the temperature of the ablation electrode, and the ablation device adjusts the power of the ablation electrode through the temperature of the ablation electrode detected by the temperature measuring element. The temperature measuring element can be a thermocouple or a temperature sensor and the like, the temperature of the ablation electrode can be detected through the temperature measuring element, the power of the ablation electrode can be adjusted in time according to the measured temperature data of the ablation electrode, and therefore the ablation electrode is always kept within a certain temperature range, and the ablation safety is further improved.

In one embodiment, the catheter further comprises a second conducting wire arranged in the catheter main body, and the second conducting wire is electrically connected with the temperature measuring element.

In one embodiment, the catheter comprises a catheter main body and an infusion tube sleeved in the catheter main body, and the infusion tube encloses to form the infusion channel.

In one embodiment, the catheter further comprises a protective sleeve arranged in the catheter body, and the first lead, the second lead and the infusion tube are all sleeved in the protective sleeve.

In one embodiment, the catheter main body comprises a support tube and a spiral tube, and the spiral tube is sleeved on the inner circumferential surface of the support tube.

In one embodiment, the helical tube is formed by winding a plurality of wires around the inner circumferential surface of the support tube. Because the ablation electrode needs to be screwed into the target tissue for ablation, the increase of the spiral tube improves the integral support of the catheter on one hand and improves the folding resistance of the twisting process of the catheter on the other hand.

In one embodiment, the catheter comprises a catheter body enclosing the infusion channel.

In one embodiment, the ablation electrode comprises at least two ring electrodes arranged at intervals along the axial direction of the catheter, the fixing piece is arranged on one side, away from the catheter, of the ring electrodes, and the circumferential surface of the outer side of each ring electrode is provided with the perfusion hole. Because the ablation electrode is mostly made of metal materials, if the length of the arranged electrode is too long, the pushing performance of the catheter after entering the blood vessel and the controllability of the catheter when the catheter is screwed in are affected. Therefore, the ablation electrode is divided into a plurality of ring electrodes, so that the ring electrodes can be properly bent to adapt to the surrounding environment change, and the operability is improved. Reasonable electrode spacing and ablation parameters are arranged between the two ring electrodes, and a continuous deeper ablation region can be formed after ablation is completed.

In one embodiment, any two adjacent ring electrodes have opposite polarities. Such an arrangement can be thought of as using bipolar ablation, which can produce a more localized electric field, resulting in a more concentrated energy.

In one embodiment, the ablation device further comprises an operating component, the operating component is arranged at one end, far away from the ablation component, of the catheter, and the operating component is used for driving the catheter and the ablation component.

In one embodiment, the operation assembly comprises an operation handle, a connector and an extension tube, the connector and the extension tube are both arranged on the operation handle, the connector is used for supplying power to the ablation electrode, and the extension tube is communicated with the infusion channel and used for inputting the physiological saline into the infusion channel.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an ablation device according to one embodiment of the invention;

FIG. 2 is a partial schematic view of a catheter and ablation assembly provided in accordance with an embodiment of the invention;

FIG. 3 is a schematic view, partially in section, of an ablation assembly provided in accordance with an embodiment of the invention;

FIG. 4 is another schematic view, partly in section, of an ablation assembly provided in accordance with an embodiment of the invention;

FIG. 5 is a perspective view of a fastener according to one embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a catheter provided in accordance with an embodiment of the present invention;

FIG. 7 is a partial schematic view of a catheter and ablation assembly provided in accordance with another embodiment of the invention;

FIG. 8 is a partial schematic view of a catheter and ablation assembly provided in accordance with another embodiment of the invention;

FIG. 9 is a partial schematic view of a catheter and ablation assembly provided in accordance with another embodiment of the invention;

fig. 10 is a schematic view of an ablation device extending into the heart, according to an embodiment of the invention.

Reference numerals:

10. an ablation device; 100. a conduit; 101. a limiting concave part; 102. a fluid infusion channel; 110. a catheter body; 111. supporting a tube; 112. a spiral tube; 120. a transfusion tube; 131. a first conductive line; 132. a second conductive line; 140. protecting the sleeve; 200. an ablation assembly; 210. a fixing member; 220. an ablation electrode; 221. a cavity; 222. a perfusion hole; 223. fixing grooves; 224. a ring electrode; 230. a connecting member; 231. a limiting convex part; 240. a temperature measuring element; 00. an operating component; 310. a control handle; 320. a connector; 330. an extension tube; 340. a valve body.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, the present invention provides an ablation device 10 including a catheter 100 and an ablation assembly 200. An infusion channel 102 is provided in the catheter 100, and the infusion channel 102 can be used for delivering a liquid such as saline. The ablation assembly 200 comprises an ablation electrode 220 and a fixing part 210, wherein the fixing part 210 is connected with one end of the ablation electrode 220, the catheter 100 is connected with the other end of the ablation electrode 220, a cavity 221 communicated with the infusion channel 102 is formed inside the ablation electrode 220, a perfusion hole 222 communicated with the cavity 221 is arranged on the ablation electrode 220 in a penetrating mode, the fixing part 210 is used for being fixed to target tissue, and the ablation electrode 220 is used for ablating the target tissue. The target tissue may be a cardiac muscle tissue.

With the ablation device 10 described above, a user can place the end of the catheter 100 having the ablation assembly 200 adjacent to a target tissue, fix the catheter to the target tissue using the fixing member 210, and ablate the target tissue using the ablation electrode 220. For example, in the treatment of a patient with a cardiac disease, a user may puncture the end of the catheter 100 with the ablation assembly 200 into the heart chamber through the skin and then fix the end of the catheter to the cardiac tissue by the fixing member 210, as shown in fig. 10, and the catheter 100 and the ablation assembly 200 at the end thereof may cross the tricuspid valve into the right ventricle through the cephalic vein, the subclavian vein, or the femoral vein, or cross the aortic valve into the left ventricle through the aorta. In some embodiments, the ablation device 10 can be a radiofrequency ablation device 10, and the ablation electrode 220 can release radiofrequency current to generate resistive electrothermal effect in the target tissue until the target tissue is dehydrated and necrosed, so as to realize ablation therapy. During treatment, the ablation electrode 220 may be fixed with the target tissue by the fixing member 210, which may prevent the ablation electrode 220 from being positionally displaced during ablation of the target tissue and losing other non-target tissue. It should be emphasized that the catheter 100 can deliver the saline into the cavity 221 of the ablation electrode 220 through the infusion channel 102, and during the treatment process, the saline in the cavity 221 can flow out from the infusion hole 222 to cool the ablation electrode 220 and the target tissue around the ablation electrode 220, so as to keep the temperature of the ablation electrode 220 and the target tissue around the ablation electrode within a certain temperature range, thereby avoiding the risk of forming eschar or thrombus and other impurities on the target tissue around the ablation electrode 220, ensuring that the ablation electrode 220 can reach a sufficient ablation depth, and improving the safety and effectiveness of the operation.

Specifically, as shown in fig. 2 and 3, in some embodiments, the ablation electrode 220 has a first end and a second end that are away from each other along the axial direction, the first end is connected to the fixing member 210, the second end is connected to the catheter 100, and the irrigation hole 222 is opened on the outer circumferential surface of the ablation electrode 220. As shown in fig. 3 and 4, the plurality of sets of perfusion holes 222 are arranged, and the plurality of sets of perfusion holes 222 are distributed at intervals on the outer circumferential surface of the ablation electrode 220 along the axial direction of the ablation electrode 220. Each set of irrigation holes 222 includes a plurality of irrigation sub-holes equally spaced circumferentially along the ablation electrode 220. Such an arrangement allows saline to cool the ablation electrode 220 and its surrounding target tissue from multiple angles, i.e., faster and more overall. In other embodiments, the plurality of irrigation sub-apertures may be distributed at non-equal intervals along the circumference of the ablation electrode 220.

It should be noted that, in the present application, the size, number, shape and arrangement of the perfusion holes 222 may be reasonably set according to the surface area of the ablation electrode 220. For example, the present application does not limit the specific shape of the perfusion hole 222, and the perfusion hole may have a circular shape, a square shape, a bar shape, or other shapes, and other descriptions are not repeated herein.

Further, as shown in fig. 1 to 5, in some embodiments, the fixing member 210 has a spiral shape with a wire diameter of 0.1 to 0.4mm, preferably 0.15 to 0.3mm, a diameter of 0.5 to 2mm, and a number of spiral turns of 2 to 10. The fixing member 210 may be made of, but not limited to, platinum-iridium alloy, nickel-cobalt-chromium-molybdenum alloy, stainless steel, titanium alloy, and other metals. The end of the fixing element 210 away from the ablation electrode 220 is pointed, and the catheter 100 is configured to rotate the fixing element 210 under an external force to drill and fix into the target tissue. This may allow the fastener 210 to more easily penetrate into the target tissue since the end of the fastener 210 distal to the catheter 100 is pointed. Because the fixing member 210 is helical, when the fixing member 210 drills into the target tissue, the fixing member 210 can abut against the target tissue around the fixing member 210 and prevent the ablation electrode 220 from moving in the axial direction and the radial direction, so that the fixing member 210 can be reliably fixed in the target tissue. After ablation of one target tissue point is completed, the fixing member 210 can be unscrewed through the catheter 100 to separate the fixing member 210 from the target tissue, and then the fixing member 210 is reused to drill into the next target point for ablation until ablation of all target tissue points is completed.

Further, as shown in fig. 1 to 4, in some embodiments, the ablation electrode 220 is substantially cylindrical, the fixing element 210 may extend in a spiral shape in a direction away from the ablation electrode 220 in an axial direction of the cylindrical ablation electrode 220, and as shown in fig. 5, an end of the fixing element 210 away from the ablation electrode 220 may be a tip. The fastener 210 can be rotated by the catheter 100 to drill into and fasten to the target tissue. Alternatively, the tip of the fixing member 210 may have a conical shape, or may have another relatively sharp shape obtained by grinding the end surface of the free end of the fixing member 210, such as a thin plate shape. In other words, the shape of the tip of the fixing member 210 is not limited, and it is intended that the fixing member 210 of the ablation electrode 220 can more easily penetrate into the target tissue.

In other embodiments, the fixing member 210 may have a screw-shaped structure, i.e., a main body having a cylindrical shape, and at least one spiral sharp protrusion is wound around an outer circumferential surface thereof.

It should be noted that during the treatment process, in some embodiments, the user can operate the catheter 100 to adjust the depth of the fixing element 210 on the ablation electrode 220 to penetrate into the target tissue according to actual needs, so as to perform the ablation treatment better. In other embodiments, the user can also operate the operation assembly 300 exposed outside the patient body to drive the catheter 100 and the ablation electrode 220 connected to the catheter 100, so as to drive the fixing element 210 on the ablation electrode 220 to drill into or screw out of the target tissue.

Further, as shown in fig. 3, in some embodiments, the ablation electrode 220 is provided with a fixing groove 223 at an end away from the catheter 100, and the fixing member 210 is embedded in the fixing groove 223.

Further, in some of these embodiments, the fixing member 210 is connected to the ablation electrode 220 in an insulated manner. For example, the surface of the fixing member 210 may be plated with an insulating coating, such as: PTFE, PI or parylene coatings, and the like. Such an arrangement may be considered that the fixing element 210 does not perform an ablation function, and thus the target tissue around the fixing element 210 is not ablated, so that the fixing element 210 can always maintain a good fixing effect with the target tissue around the fixing element.

In some embodiments, the fixing member 210 may be fixedly connected to the ablation electrode 220 by bonding, riveting, welding, or the like. In other embodiments, the fixing element 210 can be detachably connected to the ablation electrode 220 by clipping, screwing, or the like. In other embodiments, the anchor 210 may also be integrally formed with and electrically connected to the ablation electrode 220 to function as the ablation electrode 220, or both may be separately provided with a wire for multi-polar or bipolar ablation.

Referring to fig. 2 and 4, in some embodiments, the ablation tissue further includes a connecting member 230, the connecting member 230 is disposed at an end of the ablation electrode 220 close to the catheter 100, the ablation electrode 220 is connected to the catheter 100 through the connecting member 230, and the connecting member 230 can be connected to the catheter 100 in an insulated manner. The connecting member 230 may be a closed loop shape, and a middle portion thereof is disposed therethrough to provide a passage for the infusion channel 102 of the catheter 100 to communicate with the cavity 221 of the ablation electrode 220.

Specifically, as shown in fig. 2 and 4, in some embodiments, a side of the catheter 100 close to the ablation electrode 220 is provided with a limiting concave part 101, a side of the connecting element 230 facing away from the ablation electrode 220 is provided with a limiting convex part 231 matched with the limiting concave part 101, and the connecting element 230 extends into the limiting concave part 101 through the limiting convex part 231 to be fixed with the catheter 100. In other embodiments, the connection 230 may also be integrally formed with the ablation electrode 220.

Referring to fig. 2 and 4, in some embodiments, the ablation assembly 200 further includes a temperature measuring element 240 disposed in the cavity 221, wherein the temperature measuring element 240 is configured to detect a temperature of the ablation electrode 220, and the ablation device 10 adjusts the power of the ablation electrode 220 by measuring the temperature of the ablation electrode 220 via the temperature measuring element 240. The temperature measuring element 240 can be a thermocouple or a temperature sensor, the temperature of the ablation electrode 220 can be detected by the temperature measuring element 240, and the power of the ablation electrode 220 can be adjusted in time according to the measured temperature data of the ablation electrode 220, so that the ablation electrode 220 is always kept in a certain temperature range, and the ablation safety is further improved.

Referring to fig. 2 and 6, in some embodiments, the catheter 100 includes a catheter main body 110 and a fluid tube 120 sleeved in the catheter main body 110, and the fluid tube 120 encloses a fluid channel 102. In other embodiments, the infusion channel 102 may be formed by the catheter body 110 itself.

Specifically, as shown in fig. 2 and 6, in some embodiments, the catheter 100 includes a catheter body 110 and a first wire 131 and a second wire 132 disposed in the catheter body 110, wherein the first wire 131 is electrically connected to the ablation electrode 220. The first wire 131 may provide electrical energy to the ablation electrode 220, and the ablation electrode 220 may be a radiofrequency ablation electrode 220. The second conducting wire 132 is electrically connected to the temperature measuring element 240.

More specifically, as shown in fig. 2 and 6, in some embodiments, the catheter 100 further includes a protective sleeve 140 disposed in the catheter body 110, and the first guide wire 131, the second guide wire 132 and the infusion tube 120 are all sleeved in the protective sleeve 140.

Specifically, as shown in fig. 2 and 6, in some embodiments, the catheter main body 110 includes a support tube 111 and a spiral tube 112, and the spiral tube 112 is fitted around an inner circumferential surface of the support tube 111. The outer layer of the support tube 111 may be a polymer sleeve with good recovery and good biocompatibility, such as PEBAX sleeve, TPU sleeve, PA sleeve, etc.

More specifically, as shown in fig. 6, in some of the embodiments, the spiral tube 112 is formed by winding a plurality of wire coils around the inner circumferential surface of the support tube 111. The wires may be of a metallic material or a non-metallic material with good elasticity. Since the ablation electrode 220 needs to be screwed into the target tissue for ablation, the addition of the coil 112 improves the overall support of the catheter 100 on the one hand and also improves the resistance to the twisting process of the catheter 100 on the other hand.

Referring to fig. 7, 8 and 9, in some embodiments, the ablation electrode 220 includes at least two ring electrodes 224 spaced apart along the axial direction of the catheter 100, the fixing element 210 is disposed on a side of the ring electrodes 224 away from the catheter 100, and the outer circumferential surface of the ring electrodes 224 is provided with perfusion holes 222. Since the ablation electrode 220 is mostly made of metal material, if the length of the electrode is too long, the pushability and the maneuverability of the catheter 100 after it is advanced into the blood vessel are affected. Therefore, dividing the ablation electrode 220 into a plurality of ring electrodes 224 can be appropriately curved to accommodate the surrounding environmental changes, improving operability. Reasonable electrode spacing and ablation parameters are set between the two ring electrodes 224, and a continuous deeper ablation region can be formed after ablation is completed.

Specifically, as shown in fig. 8 and 9, in some embodiments, any two adjacent ring electrodes 224 are of opposite polarity. Such an arrangement may be thought of as employing bipolar ablation, which produces a more localized electric field, resulting in a more concentrated energy.

Referring to fig. 1, in some embodiments, the ablation device 10 further includes an operation component 300, the operation component 300 is disposed at an end of the catheter 100 away from the ablation component 200, and the operation component 300 is used for driving the catheter 100 and the ablation component 200.

Specifically, in some embodiments, the operation assembly 300 includes a control handle 310, a connector 320, an extension tube 330 and a connection valve body 340, wherein the connector 320 and the extension tube 330 are disposed on the control handle 310, the connector 320 is used for supplying power to the ablation electrode 220, and the extension tube 330 is communicated with the infusion channel 102 and used for inputting the saline into the infusion channel 102. The connector 320 can be electrically connected with the ablation electrode 220 and the temperature measuring element 240 through the first lead 131 and the second lead 132, respectively, and the connector 320 can also be electrically connected with an external ablation device. In some embodiments, the extension tube 330 may be considered part of the outer leak that is connected to the infusion tube 120, and the extension tube 330 may be made of a material with a larger diameter and a higher wall thickness to improve stability of the device during use. The connecting valve body 340 may be used to connect external perfusion apparatus.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

In the description herein, references to the description of "an embodiment," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Claims

1. An ablation device, comprising:

the catheter is internally provided with a transfusion channel;

the ablation assembly comprises an ablation electrode and a fixing piece, the fixing piece is connected with one end of the ablation electrode, the catheter is connected with the other end of the ablation electrode, a cavity communicated with the infusion channel is formed inside the ablation electrode, a perfusion hole communicated with the cavity is formed in the ablation electrode in a penetrating mode, the fixing piece is used for being fixed to target tissues, and the ablation electrode is used for ablating the target tissues.

2. The ablation device as claimed in claim 1, wherein the ablation electrode has a first end and a second end which are away from each other along an axial direction, the first end is connected with the fixing member, the second end is connected with the catheter, and the perfusion hole is opened on an outer circumferential surface of the ablation electrode.

3. The ablation device of claim 2, wherein the plurality of groups of the perfusion holes are arranged, and the groups of the perfusion holes are distributed on the outer circumferential surface of the ablation electrode at intervals along the axial direction of the ablation electrode.

4. The ablation device of claim 3, wherein each set of the irrigation holes comprises a plurality of irrigation sub-holes spaced circumferentially along the ablation electrode;

or each group of the perfusion holes comprises a plurality of perfusion sub-holes which are distributed at equal intervals along the circumferential direction of the ablation electrode.

5. The ablation device of claim 2, wherein the plurality of perfusion holes are arranged and distributed at intervals along the circumference of the ablation electrode;

or the plurality of perfusion holes are arranged and distributed at equal intervals along the circumferential direction of the ablation electrode.

6. The ablation device of any one of claims 1 to 5, wherein the fixing member is helical, the end of the fixing member away from the ablation electrode is a tip, and the catheter is configured to rotate the fixing member under an external force to drill and fix the fixing member into the target tissue;

and/or a fixing groove is arranged at one end of the ablation electrode, which is far away from the catheter, and the fixing piece is embedded in the fixing groove;

and/or the fixing piece is connected with the ablation electrode in an insulation mode.

7. The ablation device of any one of claims 1-5, wherein the ablation tissue further comprises a connector disposed at an end of the ablation electrode proximate the catheter, the ablation electrode being coupled to the catheter via the connector.

8. The ablation device as claimed in claim 7, wherein a limiting concave part is arranged on one side of the catheter close to the ablation electrode, a limiting convex part matched with the limiting concave part is arranged on one side of the connecting piece opposite to the ablation electrode, and the connecting piece extends into the limiting concave part through the limiting convex part to be fixed with the catheter;

or, the connecting piece and the ablation electrode are integrally formed;

and/or the connecting piece is connected with the conduit in an insulating way.

9. The ablation device of any one of claims 1-5, wherein the catheter includes a catheter body and a first wire disposed within the catheter body, the first wire being electrically connected to the ablation electrode.

10. The ablation device of claim 9, wherein the ablation assembly further comprises a temperature sensing element disposed within the cavity, the temperature sensing element configured to sense a temperature of the ablation electrode, the ablation device configured to adjust the power of the ablation electrode based on the temperature of the ablation electrode sensed by the temperature sensing element.

11. The ablation device of claim 10, wherein the catheter further comprises a second wire disposed within the catheter body, the second wire being electrically connected to the temperature sensing element.

12. The ablation device of claim 11, wherein the catheter comprises a catheter body and an infusion tube sleeved in the catheter body, the infusion tube enclosing to form the infusion channel.

13. The ablation device of claim 12, wherein the catheter further comprises a protective sheath disposed within the catheter body, the first and second leads and the infusion tube all being sheathed within the protective sheath.

14. The ablation device of claim 9, wherein the catheter body comprises a support tube and a coil, the coil being sleeved around an inner circumference of the support tube.

15. The ablation device of claim 14, wherein the helical coil is formed by a plurality of wires wound around an inner circumference of the support tube.

16. The ablation device as in any one of claims 1 to 5, wherein the catheter comprises a catheter body and an infusion tube sleeved in the catheter body, the infusion tube enclosing to form the infusion channel;

or, the catheter comprises a catheter body which encloses the infusion channel.

17. The ablation device as claimed in any one of claims 1 to 5, wherein the ablation electrode comprises at least two ring electrodes arranged at intervals along the axial direction of the catheter, the fixing member is arranged on one side of the ring electrodes away from the catheter, and the outer circumferential surface of the ring electrodes is provided with the perfusion holes.

18. The ablation device of claim 17, wherein any two adjacent ring electrodes are of opposite polarity.

19. The ablation device of any one of claims 1 to 5, further comprising an operating assembly disposed at an end of the catheter distal from the ablation assembly, the operating assembly being configured to drive the catheter and the ablation assembly.

20. The ablation device of claim 19, wherein the operating assembly includes a control handle, a connector and an extension tube, the connector and the extension tube being disposed on the control handle, the connector being configured to provide power to the ablation electrode, and the extension tube being in communication with the infusion channel and configured to deliver the saline into the infusion channel.